Triangular shaped preform



FIG. 1 is a cross section view of a circular preform with a triangularshaped cross sectional area;

FIG. 2 is a cross section view taken along lines 2-2 in FIG. 3, of acircular preform with a triangular shaped cross sectional area, shown inuse; and,

FIG. 3 is a perspective view of the circular preform with a triangularshaped cross sectional area according to FIGS. 1 and 2.

The broken lines shown in the drawings depict portions of the articlethat form no part of the claimed design.

CLAIM The ornamental design for a triangular shaped preform, as shown and described. 